426 lines
11 KiB
C#
426 lines
11 KiB
C#
//
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// XmlNamespaceManager.cs
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//
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// Authors:
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// Jason Diamond (jason@injektilo.org)
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// Ben Maurer (bmaurer@users.sourceforge.net)
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// Atsushi Enomoto (atsushi@ximian.com)
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//
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// (C) 2001 Jason Diamond http://injektilo.org/
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// (C) 2003 Ben Maurer
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// (C) 2004 Novell Inc.
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Collections;
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#if NET_2_0
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using System.Collections.Generic;
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#endif
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using System.Collections.Specialized;
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namespace System.Xml
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{
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public class XmlNamespaceManager : IXmlNamespaceResolver, IEnumerable
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{
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#region Data
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struct NsDecl {
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public string Prefix, Uri;
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}
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struct NsScope {
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public int DeclCount;
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public string DefaultNamespace;
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}
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NsDecl [] decls;
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int declPos = -1;
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NsScope [] scopes;
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int scopePos = -1;
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string defaultNamespace;
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int count;
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void InitData ()
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{
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decls = new NsDecl [10];
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scopes = new NsScope [40];
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}
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// precondition declPos == nsDecl.Length
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void GrowDecls ()
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{
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NsDecl [] old = decls;
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decls = new NsDecl [declPos * 2 + 1];
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if (declPos > 0)
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Array.Copy (old, 0, decls, 0, declPos);
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}
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// precondition scopePos == scopes.Length
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void GrowScopes ()
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{
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NsScope [] old = scopes;
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scopes = new NsScope [scopePos * 2 + 1];
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if (scopePos > 0)
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Array.Copy (old, 0, scopes, 0, scopePos);
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}
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#endregion
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#region Fields
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private XmlNameTable nameTable;
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internal const string XmlnsXml = "http://www.w3.org/XML/1998/namespace";
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internal const string XmlnsXmlns = "http://www.w3.org/2000/xmlns/";
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internal const string PrefixXml = "xml";
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internal const string PrefixXmlns = "xmlns";
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internal bool internalAtomizedNames;
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#endregion
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#region Constructor
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public XmlNamespaceManager (XmlNameTable nameTable)
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{
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if (nameTable == null)
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throw new ArgumentNullException ("nameTable");
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this.nameTable = nameTable;
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nameTable.Add (PrefixXmlns);
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nameTable.Add (PrefixXml);
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nameTable.Add (String.Empty);
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nameTable.Add (XmlnsXmlns);
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nameTable.Add (XmlnsXml);
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InitData ();
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}
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#endregion
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#region Properties
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public virtual string DefaultNamespace {
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get { return defaultNamespace == null ? string.Empty : defaultNamespace; }
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}
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#if NET_2_0
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public virtual XmlNameTable NameTable {
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#else
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public XmlNameTable NameTable {
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#endif
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get { return nameTable; }
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}
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#endregion
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#region Methods
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public virtual void AddNamespace (string prefix, string uri)
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{
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AddNamespace (prefix, uri, false);
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}
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void AddNamespace (string prefix, string uri, bool atomizedNames)
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{
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if (prefix == null)
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throw new ArgumentNullException ("prefix", "Value cannot be null.");
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if (uri == null)
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throw new ArgumentNullException ("uri", "Value cannot be null.");
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if (!atomizedNames) {
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prefix = nameTable.Add (prefix);
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uri = nameTable.Add (uri);
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}
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if (prefix == PrefixXml && uri == XmlnsXml)
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return;
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IsValidDeclaration (prefix, uri, true);
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if (prefix.Length == 0)
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defaultNamespace = uri;
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for (int i = declPos; i > declPos - count; i--) {
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if (object.ReferenceEquals (decls [i].Prefix, prefix)) {
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decls [i].Uri = uri;
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return;
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}
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}
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declPos ++;
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count ++;
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if (declPos == decls.Length)
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GrowDecls ();
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decls [declPos].Prefix = prefix;
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decls [declPos].Uri = uri;
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}
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static string IsValidDeclaration (string prefix, string uri, bool throwException)
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{
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string message = null;
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// It is funky, but it does not check whether prefix
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// is equivalent to "xml" in case-insensitive means.
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if (prefix == PrefixXml && uri != XmlnsXml)
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message = String.Format ("Prefix \"xml\" can only be bound to the fixed namespace URI \"{0}\". \"{1}\" is invalid.", XmlnsXml, uri);
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else if (message == null && prefix == "xmlns")
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message = "Declaring prefix named \"xmlns\" is not allowed to any namespace.";
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else if (message == null && uri == XmlnsXmlns)
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message = String.Format ("Namespace URI \"{0}\" cannot be declared with any namespace.", XmlnsXmlns);
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if (message != null && throwException)
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throw new ArgumentException (message);
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else
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return message;
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}
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public virtual IEnumerator GetEnumerator ()
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{
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// In fact it returns such table's enumerator that contains all the namespaces.
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// while HasNamespace() ignores pushed namespaces.
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Hashtable ht = new Hashtable ();
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for (int i = 0; i <= declPos; i++) {
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if (decls [i].Prefix != string.Empty && decls [i].Uri != null) {
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ht [decls [i].Prefix] = decls [i].Uri;
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}
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}
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ht [string.Empty] = DefaultNamespace;
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ht [PrefixXml] = XmlnsXml;
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ht [PrefixXmlns] = XmlnsXmlns;
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return ht.Keys.GetEnumerator ();
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}
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#if NET_2_0
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public virtual IDictionary<string, string> GetNamespacesInScope (XmlNamespaceScope scope)
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{
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IDictionary namespaceTable = GetNamespacesInScopeImpl (scope);
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IDictionary<string, string> namespaces = new Dictionary<string, string>(namespaceTable.Count);
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foreach (DictionaryEntry entry in namespaceTable) {
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namespaces[(string) entry.Key] = (string) entry.Value;
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}
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return namespaces;
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}
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#else
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IDictionary IXmlNamespaceResolver.GetNamespacesInScope (XmlNamespaceScope scope)
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{
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return GetNamespacesInScopeImpl (scope);
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}
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#endif
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internal virtual IDictionary GetNamespacesInScopeImpl (XmlNamespaceScope scope)
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{
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Hashtable table = new Hashtable ();
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if (scope == XmlNamespaceScope.Local) {
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for (int i = 0; i < count; i++)
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if (decls [declPos - i].Prefix == String.Empty && decls [declPos - i].Uri == String.Empty) {
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if (table.Contains (String.Empty))
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table.Remove (String.Empty);
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}
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else if (decls [declPos - i].Uri != null)
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table.Add (decls [declPos - i].Prefix, decls [declPos - i].Uri);
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return table;
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} else {
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for (int i = 0; i <= declPos; i++) {
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if (decls [i].Prefix == String.Empty && decls [i].Uri == String.Empty) {
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// removal of default namespace
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if (table.Contains (String.Empty))
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table.Remove (String.Empty);
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}
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else if (decls [i].Uri != null)
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table [decls [i].Prefix] = decls [i].Uri;
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}
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if (scope == XmlNamespaceScope.All)
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table.Add ("xml", XmlNamespaceManager.XmlnsXml);
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return table;
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}
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}
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public virtual bool HasNamespace (string prefix)
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{
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return HasNamespace (prefix, false);
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}
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bool HasNamespace (string prefix, bool atomizedNames)
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{
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if (prefix == null || count == 0)
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return false;
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for (int i = declPos; i > declPos - count; i--) {
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if (decls [i].Prefix == prefix)
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return true;
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}
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return false;
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}
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public virtual string LookupNamespace (string prefix)
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{
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switch (prefix) {
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case PrefixXmlns:
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return nameTable.Get (XmlnsXmlns);
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case PrefixXml:
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return nameTable.Get (XmlnsXml);
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case "":
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return DefaultNamespace;
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case null:
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return null;
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}
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for (int i = declPos; i >= 0; i--) {
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if (CompareString (decls [i].Prefix, prefix, internalAtomizedNames) && decls [i].Uri != null /* null == flag for removed */)
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return decls [i].Uri;
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}
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return null;
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}
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internal string LookupNamespace (string prefix, bool atomizedNames)
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{
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internalAtomizedNames = atomizedNames;
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string ret = LookupNamespace (prefix);
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internalAtomizedNames = false;
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return ret;
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}
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public virtual string LookupPrefix (string uri)
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{
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#if NET_2_0
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return LookupPrefix (uri, false);
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#else
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return LookupPrefix (uri, true);
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#endif
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}
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private bool CompareString (string s1, string s2, bool atomizedNames)
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{
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if (atomizedNames)
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return object.ReferenceEquals (s1, s2);
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else
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return s1 == s2;
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}
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internal string LookupPrefix (string uri, bool atomizedName)
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{
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return LookupPrefixCore (uri, atomizedName, false);
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}
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internal string LookupPrefixExclusive (string uri, bool atomizedName)
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{
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return LookupPrefixCore (uri, atomizedName, true);
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}
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string LookupPrefixCore (string uri, bool atomizedName, bool excludeOverriden)
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{
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if (uri == null)
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return null;
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if (CompareString (uri, DefaultNamespace, atomizedName))
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return string.Empty;
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if (CompareString (uri, XmlnsXml, atomizedName))
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return PrefixXml;
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if (CompareString (uri, XmlnsXmlns, atomizedName))
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return PrefixXmlns;
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for (int i = declPos; i >= 0; i--) {
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if (CompareString (decls [i].Uri, uri, atomizedName) && decls [i].Prefix.Length > 0) // we already looked for ""
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if (!excludeOverriden || !IsOverriden (i))
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return decls [i].Prefix;
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}
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// ECMA specifies that this method returns String.Empty
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// in case of no match. But actually MS.NET returns null.
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// For more information,see
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// http://lists.ximian.com/archives/public/mono-list/2003-January/005071.html
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//return String.Empty;
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return null;
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}
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bool IsOverriden (int idx)
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{
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if (idx == declPos)
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return false;
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string prefix = decls [idx + 1].Prefix;
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for (int i = idx + 1; i <= declPos; i++)
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if ((object) decls [idx].Prefix == (object) prefix)
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return true;
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return false;
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}
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public virtual bool PopScope ()
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{
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if (scopePos == -1)
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return false;
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declPos -= count;
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defaultNamespace = scopes [scopePos].DefaultNamespace;
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count = scopes [scopePos].DeclCount;
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scopePos --;
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return true;
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}
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public virtual void PushScope ()
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{
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scopePos ++;
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if (scopePos == scopes.Length)
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GrowScopes ();
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scopes [scopePos].DefaultNamespace = defaultNamespace;
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scopes [scopePos].DeclCount = count;
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count = 0;
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}
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// It is rarely used, so we don't need NameTable optimization on it.
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public virtual void RemoveNamespace (string prefix, string uri)
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{
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RemoveNamespace (prefix, uri, false);
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}
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void RemoveNamespace (string prefix, string uri, bool atomizedNames)
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{
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if (prefix == null)
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throw new ArgumentNullException ("prefix");
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if (uri == null)
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throw new ArgumentNullException ("uri");
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if (count == 0)
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return;
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for (int i = declPos; i > declPos - count; i--) {
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if (CompareString (decls [i].Prefix, prefix, atomizedNames) && CompareString (decls [i].Uri, uri, atomizedNames))
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decls [i].Uri = null;
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}
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}
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#endregion
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}
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}
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